Abstract:
Group II-VI semiconductors have countless significance in application of solar cells owing
to their admirable opto-electrical properties. Current research is primarily focused on the
optimization of cadmium sulfide (CdS) thin films with precise interest in solar cells
applications. Closed space sublimation (CSS), a coating system has been settled and
fabricated CdS thin films. Cadmium sulfide is transparent to the visible and infra-red
regions of electromagnetic radiations. Current study concerned toward progress of CdS
thin films to be used as a material for window layer using closed space sublimation
technique.
Thin films of CdS were fabricated on substrate of glass by closed space sublimation
technique. The temperature of source during deposition was 450 ̊C and level of vacuum
was in range of 10−2 mbar. As-deposited thin films were embedded with copper
nanoparticles (Cu NPs) by spin coating for an optimized time at 2500rpm. The structural,
morphological, electrical and optical analyses were done by using X-Ray Diffraction
(XRD), Hall Measurement System, Atomic Force Microscopy (AFM) and Ultra violet
visible (UV-VIS) Spectrophotometer respectively. The X-ray studies revealed a hexagonal
structure with (111) as the preferred orientation. The average crystallite size was in the
range of 50-57nm. CdS film transmittance reduced from 60% to 30% with increasing Cu
NPs embedding. CdS films optical band gap of decreases from 2.37 to 2.25 eV with
increasing Cu NPs embedding. Surface roughness was increased after Cu NPs embedding
revealed from Atomic force microscopy (AFM). The conductivity increased from 5.49 ×
101
to 1.17 × 103
(S.cm-1
) owed to variation in the carrier concentration and with increase
in value of mobility
